They’ll last about five minutes in anything rocky. The axle design looks a lot like the Point One Racing pedals; sure the axle and body are strong enough but with the axle tapering to that small a diameter at the end, the bearings are going to be tiny.
The Point Ones have three uber small bearings at the end of their axle and I still managed to pulverize them into dust over three days in Verbier; and I mean pulverize them. When I took them apart and the dust fell out, I had to look at the service manual before I believed they had actually had bearings in them.